21619874136 has 32 divisors (see below), whose sum is σ = 61771069440. Its totient is φ = 6177106848.

The previous prime is 21619874131. The next prime is 21619874137. The reversal of 21619874136 is 63147891612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21619874131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64344696 + ... + 64345031.

It is an arithmetic number, because the mean of its divisors is an integer number (1930345920).

Almost surely, 2^21619874136 is an apocalyptic number.

It is an amenable number.

21619874136 is an abundant number, since it is smaller than the sum of its proper divisors (40151195304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21619874136 is a wasteful number, since it uses less digits than its factorization.

21619874136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128689743 (or 128689739 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The spelling of 21619874136 in words is "twenty-one billion, six hundred nineteen million, eight hundred seventy-four thousand, one hundred thirty-six".